dependency: bump org.apache.maven.plugins:maven-javadoc-plugin from 3.5.0 to 3.6.2 in /sevntu-checkstyle-sonar-plugin #312

Job	Run time
no-exception (checkstyle)	1m 25s
no-exception (struts)	1m 47s
no-exception (guava)	3m 24s
no-exception (hibernate-orm)	2m 29s
no-exception (spotbugs)	2m 23s
no-exception (spring-framework)	1m 51s
no-exception (hbase)	3m 59s
no-exception (pmd-elasticsearch-lombok-ast)	6m 7s
no-exception (alot-of-projects)	2m 31s
	25m 56s

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